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1.
Psychophysiology ; 61(11): e14643, 2024 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-38970156

RESUMO

Social comparison is central in human life and can be especially challenging in depression and social anxiety. We assessed event-related potentials and emotions using a social comparison task in which participants received feedback on both their own and a co-player's performance, in participants with depression and/or social anxiety (n = 63) and healthy controls (n = 72). Participants reported more negative emotions for downward (being better than the co-player [participant correct, co-player wrong]) and upward (being worse than the co-player [participant wrong, co-player correct]) comparisons versus even outcomes, with these effects being stronger in depression and social anxiety. At the Medial Frontal Negativity, both controls and depressed participants showed a more negative amplitude for upward comparison versus both the participant and co-player performing wrong. Socially anxious subjects showed the opposite effect, possibly due to greater expectations about being worse than others. The P300 decreased for downward and upward comparisons compared to even outcomes, which may relate to the higher levels of conflict of social inequality. Depressed and socially anxious subjects showed a blunted P300 increase over time in response to the task outcomes, suggesting deficits in allocating resources for the attention of incoming social information. The LPP showed increased amplitude for downward and upward comparison versus the even outcomes and no group effect. Emotional findings suggest that social comparisons are more difficult for depressed and socially anxious individuals. Event-related potentials findings may shed light on the neural substrates of these difficulties.


Assuntos
Depressão , Eletroencefalografia , Potenciais Evocados , Humanos , Masculino , Feminino , Adulto Jovem , Adulto , Potenciais Evocados/fisiologia , Depressão/fisiopatologia , Comparação Social , Ansiedade/fisiopatologia , Potenciais Evocados P300/fisiologia , Emoções/fisiologia , Adolescente
2.
PLoS One ; 19(7): e0290142, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38959207

RESUMO

AIM: This preliminary study investigated the differences in event-related potential and reaction time under two groups (athletes vs. non-athletes). MATERIAL AND METHODS: The P300 was analyzed for Fz, Cz, and Pz electrodes in thirty-one healthy volunteers divided into two groups (volleyball athletes and non-athletes). In addition, the participants performed a saccadic eye movement task to measure reaction time. RESULTS: The EEG analysis showed that the athletes, in comparison to the no-athletes, have differences in the P300 in the frontal area (p = 0.021). In relation to reaction time, the results show lower reaction time for athletes (p = 0.001). CONCLUSIONS: The volleyball athletes may present a greater allocation of attention during the execution of the inhibition task, since they have a lower reaction time for responses when compared to non-athletes.


Assuntos
Atletas , Eletroencefalografia , Tempo de Reação , Movimentos Sacádicos , Voleibol , Humanos , Tempo de Reação/fisiologia , Movimentos Sacádicos/fisiologia , Voleibol/fisiologia , Masculino , Feminino , Adulto Jovem , Adulto , Potenciais Evocados/fisiologia , Potenciais Evocados P300/fisiologia , Atenção/fisiologia
3.
J Neurosci Methods ; 376: 109608, 2022 07 01.
Artigo em Inglês | MEDLINE | ID: mdl-35487316

RESUMO

BACKGROUND: Previous work showed that elderly with excess in theta activity in their resting state electroencephalogram (EEG) are at higher risk of cognitive decline than those with a normal EEG. By using event-related potentials (ERP) during a counting Stroop task, our prior work showed that elderly with theta excess have a large P300 component compared with normal EEG group. This increased activity could be related to a higher EEG signal energy used during this task. NEW METHOD: By wavelet analysis applied to ERP obtained during a counting Stroop task we quantified the energy in the different frequency bands of a group of elderly with altered EEG. RESULTS: In theta and alpha bands, the total energy was higher in elderly subjects with theta excess, specifically in the stimulus categorization window (258-516 ms). Both groups solved the task with similar efficiency. COMPARISON WITH EXISTING METHODS: The traditional ERP analysis in elderly compares voltage among conditions and groups for a given time window, while the frequency composition is not usually examined. We complemented our previous ERP analysis using a wavelet methodology. Furthermore, we showed the advantages of wavelet analysis over Short Time Fourier Transform when exploring EEG signal during this task. CONCLUSIONS: The higher EEG signal energy in ERP might reflect undergoing neurobiological mechanisms that allow the elderly with theta excess to cope with the cognitive task with similar behavioral results as the normal EEG group. This increased energy could promote a metabolic and cellular dysregulation causing a greater decline in cognitive function.


Assuntos
Potenciais Evocados , Análise de Ondaletas , Idoso , Eletroencefalografia/métodos , Potenciais Evocados P300/fisiologia , Potenciais Evocados/fisiologia , Humanos , Teste de Stroop
4.
Neurol Sci ; 42(6): 2309-2316, 2021 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-33037974

RESUMO

BACKGROUND: The current study is a reanalysis in the time domain of EEG data collection in healthy adults during an oddball paradigm using levetiracetam (LEV) vs. placebo acute administration. Specifically, the event-related potential (ERP) technique provides a tool for exploring the EEG responses to a specific event/stimulus. One of the ERP components widely studied is the P300 component, which is associated with the last stage of information processing and a general measurement of "cognitive efficiency." METHODS: The sample was composed of thirteen healthy right-handed individuals randomized to participate under two conditions: LEV and placebo. Electrophysiological measures were collected before and after drug intake. We explored the oddball paradigm, which is commonly used with healthy individuals to investigate the stages of information processing. RESULTS: The electrophysiological results showed a main effect of condition on P300 amplitude for the frontal (F3, Fz, F4), central (C3, Cz, C4), and parietal electrodes (P3, Pz, P4). The post hoc comparisons (Scheffé's test) demonstrated the significant differences between electrodes. Regarding P300 latency, all regions represented a main effect of condition. A P300 latency reduction was observed during LEV condition compared with placebo. CONCLUSION: Our study observed the ERP component-P300-through the variation of its amplitude and latency to evaluate a supposed higher CNS efficiency when participants were under the LEV effect. Our findings sustain this premise, mainly due to reducing in P300 latency for the LEV condition, supporting the neural efficiency hypothesis.


Assuntos
Cognição/efeitos dos fármacos , Eletroencefalografia , Potenciais Evocados , Levetiracetam/farmacologia , Adulto , Potenciais Evocados P300 , Humanos , Tempo de Reação
5.
Clin EEG Neurosci ; 52(3): 193-200, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-32945192

RESUMO

BACKGROUND: Apolipoprotein ε4 allele (APOE4) is the strongest genetic risk factor for Alzheimer's disease and seems to be related to cognitive decline and damaged event-related potential P300, which is a sensitive measure to assess cognitive processing. OBJECTIVE: This research aims to critically review the existing scientific evidence regarding the association between APOE4 and P300. METHODS: A systematic review was carried out up to January 2020 on the following databases: Web of Science, Scopus and Medline/PubMed. Articles were considered for inclusion if they are original research that provided information regarding the association between APOE4 and P300, available in English, Spanish, or Portuguese, and available in full text. The methodological quality of the studies selected was evaluated using the quality assessment tool for observational cohort and cross-sectional studies recommended by Cochrane. RESULTS: Out of 993 studies, 14 met the inclusion criteria. The results obtained showed that APOE4 is related to a longer P300 latency. However, the data supplied do not allow us to confirm if this relationship also occurs in amplitude measures. Moreover, it was observed that APOE genotype may influence P300 in different ages, from younger individuals to demented older people. CONCLUSION: Evidence shows that APOE4 negatively influences cortical activities related to cognitive functions, as indicated by P300.


Assuntos
Doença de Alzheimer , Apolipoproteína E4 , Idoso , Idoso de 80 Anos ou mais , Doença de Alzheimer/genética , Apolipoproteína E4/genética , Estudos Transversais , Eletroencefalografia , Potenciais Evocados P300/genética , Humanos
6.
Sensors (Basel) ; 20(24)2020 Dec 16.
Artigo em Inglês | MEDLINE | ID: mdl-33339105

RESUMO

The P300 paradigm is one of the most promising techniques for its robustness and reliability in Brain-Computer Interface (BCI) applications, but it is not exempt from shortcomings. The present work studied single-trial classification effectiveness in distinguishing between target and non-target responses considering two conditions of visual stimulation and the variation of the number of symbols presented to the user in a single-option visual frame. In addition, we also investigated the relationship between the classification results of target and non-target events when training and testing the machine-learning model with datasets containing different stimulation conditions and different number of symbols. To this end, we designed a P300 experimental protocol considering, as conditions of stimulation: the color highlighting or the superimposing of a cartoon face and from four to nine options. These experiments were carried out with 19 healthy subjects in 3 sessions. The results showed that the Event-Related Potentials (ERP) responses and the classification accuracy are stronger with cartoon faces as stimulus type and similar irrespective of the amount of options. In addition, the classification performance is reduced when using datasets with different type of stimulus, but it is similar when using datasets with different the number of symbols. These results have a special connotation for the design of systems, in which it is intended to elicit higher levels of evoked potentials and, at the same time, optimize training time.


Assuntos
Interfaces Cérebro-Computador , Potenciais Evocados P300 , Estimulação Luminosa , Humanos , Reprodutibilidade dos Testes
7.
Rev Neurol ; 71(1): 11-18, 2020 Jul 01.
Artigo em Espanhol | MEDLINE | ID: mdl-32583410

RESUMO

INTRODUCTION: The value of the P300 cognitive event-related potential in the diagnosis of Alzheimer subtype neurocognitive disorders is still incipient. Recent studies suggest that combining it with neuropsychological tests by cognitive domains would allow an objective and early characterisation of the cognitive impairment in its initial stages. AIMS: To characterise the electrophysiological patterns in the P300 potential that obtain a discriminatory value for the diagnosis and classification of the neurocognitive disorders with a possible Alzheimer-type aetiology. SUBJECTS AND METHODS: This study examines 39 patients classified, according to the DSM-5, with possible Alzheimer-type minor and major neurocognitive disorders, aged between 50 and 85 years, and 53 control subjects with normal cognitive functions. The P300 potential is registered in the auditory mode, oddball paradigm and centroparietal recording. RESULTS: P300 latency is significantly prolonged in subjects with neurocognitive disorder; there are significant differences in the mean values and confidence intervals between healthy controls and patients. No significant differences are obtained in P300 latency between groups with minor and major neurocognitive disorder. The mean amplitude value decreases in neurocognitive disorder, and the P300 amplitude logarithm of the control groups and those with minor and major neurocognitive disorder reaches significantly different mean values and confidence intervals. CONCLUSIONS: The parameters quantified in the P300 potential can be used as complementary biomarkers to classify the presence and level of cognitive dysfunction with a possible Alzheimer-type aetiology.


TITLE: Potencial relacionado con eventos cognitivos P300 en el diagnóstico y clasificación del trastorno neurocognitivo debido a enfermedad de Alzheimer posible.Introducción. El valor del potencial relacionado con eventos cognitivos P300 en el diagnóstico de los trastornos neurocognitivos subtipo Alzheimer es aún incipiente. Estudios recientes sugieren que su combinación con tests neuropsicológicos por dominios cognitivos permitiría caracterizar de forma objetiva y precoz el déficit cognitivo en sus etapas iniciales. Objetivo. Caracterizar los patrones electrofisiológicos en el potencial P300 que obtengan un valor discriminativo para el diagnóstico y clasificación de los trastornos neurocognitivos de etiología enfermedad de Alzheimer posible. Sujetos y métodos. Se estudia a 39 pacientes clasificados, según el DSM-5, con trastorno neurocognitivo menor y mayor debido a enfermedad de Alzheimer posible, en un rango de edad de 50-85 años, y a 53 sujetos control con funciones cognitivas normales. Se registra el potencial P300 en la modalidad auditiva, paradigma de oddball y registro centroparietal. Resultados. La latencia P300 se prolonga significativamente en los sujetos con trastorno neurocognitivo; sus valores medios e intervalos de confianza son significativamente diferentes entre los controles sanos y los pacientes. No se obtienen diferencias significativas de latencia P300 entre los grupos con trastorno neurocognitivo menor y mayor. El valor medio de amplitud disminuye en el trastorno neurocognitivo, y el logaritmo de amplitud P300 obtiene valores medios e intervalos de confianza significativamente diferentes entre los grupos control y con trastorno neurocognitivo menor y mayor. Conclusiones. Los parámetros cuantificados en el potencial P300 pueden utilizarse como biomarcadores complementarios clasificadores de la presencia y del nivel de la disfunción cognitiva de etiología enfermedad de Alzheimer posible.


Assuntos
Potenciais Evocados P300 , Transtornos Neurocognitivos/diagnóstico , Idoso , Idoso de 80 Anos ou mais , Doença de Alzheimer/diagnóstico , Doença de Alzheimer/fisiopatologia , Disfunção Cognitiva/diagnóstico , Disfunção Cognitiva/fisiopatologia , Intervalos de Confiança , Diagnóstico Precoce , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Transtornos Neurocognitivos/classificação , Transtornos Neurocognitivos/fisiopatologia , Testes Neuropsicológicos , Tempo de Reação
8.
Sci Rep ; 10(1): 7771, 2020 05 08.
Artigo em Inglês | MEDLINE | ID: mdl-32385310

RESUMO

Working memory (WM) impairments in ADHD have been consistently reported along with deficits in attentional control. Yet, it is not clear which specific WM processes are affected in this condition. A deficient coupling between attention and WM has been reported. Nevertheless, most studies focus on the capacity to retain information rather than on the attention-dependent stages of encoding and retrieval. The current study uses a visual short-term memory binding task, measuring both behavioral and electrophysiological responses to characterize WM encoding, binding and retrieval comparing ADHD and non-ADHD matched adolescents. ADHD exhibited poorer accuracy and larger reaction times than non-ADHD on all conditions but especially when a change across encoding and test displays occurred. Binding manipulation affected equally both groups. Encoding P3 was larger in the non-ADHD group. Retrieval P3 discriminated change only in the non-ADHD group. Binding-dependent ERP modulations did not reveal group differences. Encoding and retrieval P3 were significantly correlated only in non-ADHD. These results suggest that while binding processes seem to be intact in ADHD, attention-related encoding and retrieval processes are compromised, resulting in a failure in the prioritization of relevant information. This new evidence can also inform recent theories of binding in visual WM.


Assuntos
Transtorno do Deficit de Atenção com Hiperatividade/fisiopatologia , Transtorno do Deficit de Atenção com Hiperatividade/psicologia , Atenção , Cognição , Memória de Curto Prazo , Adolescente , Transtorno do Deficit de Atenção com Hiperatividade/diagnóstico , Potenciais Evocados P300 , Potenciais Evocados , Feminino , Humanos , Masculino , Tempo de Reação
9.
PLoS One ; 15(5): e0232839, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32384118

RESUMO

BACKGROUND/OBJECTIVE: The effects of otitis media on the function of the central auditory nervous system in different populations is unknown. Understanding how the history of otitis media affects children from different nations will guide health professionals worldwide on the importance of adequate auditory stimulus in childhood. For this reason, the aim of the present study was to investigate the long-term auditory effects of middle ear disease on temporal processing and P300 in two different populations of children: Australian and Brazilian. METHODS: Temporal processing tests (Frequency Pattern Tests-FPT and Gaps in noise-GIN) and P300 were measured in 68 Brazilian and Australian children, aged between 8 to 14 years. The Brazilian otitis media group (BrOM) and Australian otitis media group (AusOM) consisted of 20 children each who had a documented history of otitis media. Control groups of 14 children (BrControl and AusControl) were also recruited from each country, all with no documented history of otitis media. RESULTS: The BrOM group showed significantly poorer performance (p<0.001) for FPT and the GIN compared to BrControl. The P300 response showed significantly longer mean latencies (p = 0.02) compared to BrControls. The AusOM group also showed significant delayed latency of P300 (p = 0.04) compared to the AusControl. The FPT showed significantly poorer performance (p = 0.04) compared to AusControls. The two otitis media groups showed no significant differences between each other on P300. Significant differences were seen however in temporal processing tests performance between the two cohorts for the otitis media groups. The BrOM group had significantly poorer responses (p<0.001) for FPT and GIN compared to the AusOM group. CONCLUSIONS: These findings support that although differences exist between BrOM and AusOM groups, otitis media can be demonstrated to affect the underlying mechanisms of the P300 measures and behavioral auditory responses in two different populations of children.


Assuntos
Potenciais Evocados P300 , Transtornos do Desenvolvimento da Linguagem/etiologia , Otite Média com Derrame/fisiopatologia , Percepção do Tempo/fisiologia , Estimulação Acústica , Adolescente , Córtex Auditivo/fisiopatologia , Limiar Auditivo , Austrália , Brasil , Criança , Estudos Transversais , Feminino , Humanos , Transtornos do Desenvolvimento da Linguagem/diagnóstico , Transtornos do Desenvolvimento da Linguagem/fisiopatologia , Transtornos do Desenvolvimento da Linguagem/psicologia , Masculino , Testes Neuropsicológicos , Otite Média com Derrame/psicologia , Desempenho Psicomotor , Recidiva , Estudos Retrospectivos , Tálamo/fisiopatologia
10.
Rev cuba neurol neurocir ; 10(1)Ene-Abr. 2020. tab, graf
Artigo em Espanhol | CUMED | ID: cum-76946

RESUMO

Objetivo: Evaluar la relación entre el potencial relacionado a eventos P300 con significado atencional visual y los resultados de la evaluación neuropsicológica en pacientes conenfermedad de Parkinson en estadios II y III de Hoehn y Yahr.Métodos: Se realizó un estudio analítico transversal donde se evaluaron 57 pacientes con enfermedad de Parkinson idiopática, atendidos entre diciembre de 2017 y abril de 2018, en el Centro Internacional de Restauración Neurológica, de La Habana. Se realizó el registro de P300, durante la ejecución de una tarea de atención sostenida visual. Se midió latencia y amplitud de la P300, lo que se correlacionó (test de correlaciones de Spearman, p< 0,01)con las variables demográficas, variables de eficiencia en la tarea de atención sostenida y variables neuropsicológicas. Se compararon los resultados de los grupos II y III de Hoehn y Yahr con respecto a todas las variables estudiadas (test de la U de Mann Whitney, p< 0,05).Resultados: Se constató una significativa diferencia de latencia entre grupos del componente P300 en el electrodo Pz. Fue más prolongado en el grupo III de Hoehn y Yahr.Se evidenciaron en el grupo II correlaciones negativas entre la latencia de P300 y el test de batería de evaluación frontal, y positivas entre la latencia de P300 y la prueba de Stroop.Las correlaciones entre el test de ba(AU)


Objective: To evaluate the relationship between the P300 event-related potential with visual attention significance and the results of neuropsychological evaluation in patientswith Parkinson's disease in Hoehn and Yahr stages II and III.Methods: A cross-sectional analytical study was carried out evaluating 57 patients with idiopathic Parkinson's disease, who were treated from December 2017 to April 2018 at theInternational Center for Neurological Restoration, in Havana. P300 was recorded during the execution of a visual sustained attention task. The latency and amplitude of P300 weremeasured, which was correlated (Spearman's correlation test, p <0.01) with demographic variables, efficiency variables in the sustained attention task and neuropsychological variables. The results of Hoehn and Yahr groups II and III were compared with respect to all the variables studied (Mann Whitney U test, p <0.05).Results: Significant latency difference was found between groups of P300 component in Pz electrode. It was more prolonged in Hoehn and Yahr group III. Negative correlations were found in group II between P300 latency and the frontal evaluation battery test, andpositive correlations between P300 latency and Stroop test. The correlations between the frontal evaluation battery test and P300 amplitude were positive, and between Stroop test and P300 amplitude were negative. Similar results were evident in group III regarding P300 amplitude, which corresponded to worse performance in the neuropsychological evaluation.Conclusions: A close relationship between P300 event-related potential with visual attention significance and the results of the neuropsychological evaluation in Parkinson's disease patients, in Hoehn and Yahr stages II and III, was verified. P300 potential was an objective examination that reinforced the validity of the neuropsychological evaluationresults(AU)


Assuntos
Humanos , Masculino , Feminino , Pessoa de Meia-Idade , Doença de Parkinson/diagnóstico , Doença de Parkinson/tratamento farmacológico , Potenciais Evocados P300 , Antiparkinsonianos/administração & dosagem , Antiparkinsonianos/uso terapêutico , Testes Neuropsicológicos , Eletroencefalografia
11.
Int. j. morphol ; 38(2): 356-362, abr. 2020. tab, graf
Artigo em Espanhol | LILACS | ID: biblio-1056447

RESUMO

El suicidio es un problema de salud a nivel mundial, siendo la conducta suicida uno de los predictores de mortalidad por suicidio; sin embargo, su valoración aún sigue siendo compleja. Aunque la cantidad de literatura que ha abordado distintas perspectivas de la conducta suicida es abundante, se requiere ahondar en nuevos métodos que permitan una valoración rápida y objetiva de ésta, proporcionando a los clínicos y pacientes, un sistema de evaluación que registre los cambios de estados emocionales de manera dinámica. El objetivo de este manuscrito fue proporcionar una visión general de la morfología de los potenciales evocados auditivos de latencia tardía p300 y su rol en la evaluación de la conducta suicida.


Suicide is a global health problem, with suicidal behavior being one of the predictors of suicide mortality; however, its assessment is still complex. Although the amount of literature that has addressed different perspectives of suicidal behavior is abundant, it is necessary to deepen new methods that allow a rapid and objective assessment of it, providing clinicians and patients with an evaluation system that allows changes in emotional state to be recorded dynamically. The aim of this manuscript was to provide an overview of morphological patterns of auditory evoked potential P300 latency late in the assessment of suicidal behavior.


Assuntos
Comportamento do Adolescente/fisiologia , Potenciais Evocados P300/fisiologia , Ideação Suicida , Valores de Referência , Eletrofisiologia , Potenciais Evocados Auditivos/fisiologia
12.
Braz. j. otorhinolaryngol. (Impr.) ; Braz. j. otorhinolaryngol. (Impr.);86(1): 119-126, Jan.-Feb. 2020. tab
Artigo em Inglês | LILACS | ID: biblio-1089359

RESUMO

Abstract Introduction Tinnitus is sound perception in the absence of a sound source. Changes in parameters of latency and amplitude on the auditory event related potentials or long latency potentials waves have been cited in tinnitus patients when compared to a control group. Objective To perform an assessment of scientific evidence that verifies the possibility of alterations in latency or amplitude of the waves of event related potentials in individuals with tinnitus. Methods By using SciELO, Lilacs, ISI Web and PubMed, scientific databases, a review was performed. Articles published in English, Portuguese, French and Spanish that correlated tinnitus with changes in event related potentials were included in this review. Results Twelve articles were located, however only eight fulfilled the criteria for inclusion. Conclusion The sample of selected studies demonstrate that the long latency auditory evoked potentials related to events between the control and tinnitus patients showed some changes in latency and or amplitude in tinnitus patients. There are changes in event-related potentials when comparing patients with tinnitus and the control group. These changes take place considering the severity of tinnitus, tinnitus site of lesion, and capacity for changes after interventions. The event related potentials can help to determine the neurotransmitter involved in tinnitus generation and evaluate tinnitus treatments.


Resumo Introdução O zumbido é a percepção de um som na ausência de uma fonte sonora. Mudanças nos parâmetros de latência e amplitude nas ondas dos potenciais evocados auditivos relacionados a eventos ou potenciais de longa latência foram citadas em pacientes com zumbido quando comparados a um grupo controle. Objetivo Realizar uma avaliação de evidências científicas que verifiquem a possibilidade de alterações na latência ou amplitude das ondas de potenciais evocados auditivos relacionados a eventos em indivíduos com zumbido. Método Foi feita uma revisão a partir dos bancos de dados científicos SciELO, Lilacs, ISI Web e PubMed. Artigos publicados em inglês, português, francês e espanhol que correlacionavam zumbido com alterações nos potenciais evocados auditivos relacionados a eventos foram incluídos. Resultados Foram localizados 12 artigos, porém apenas oito preencheram os critérios de inclusão. Conclusão A amostra de estudos selecionados demonstra que os potenciais evocados auditivos de longa latência relacionados a eventos entre os pacientes-controle e com zumbido apresentaram algumas alterações na latência e/ou amplitude nos pacientes com zumbido. Há mudanças nos potenciais relacionados a eventos ao comparar pacientes com zumbido e o grupo controle. Essas alterações consideram a gravidade do zumbido, o local da lesão do zumbido e a capacidade de alterações após as intervenções. Os potenciais evocados auditivos relacionados a eventos podem ajudar a determinar o neurotransmissor envolvido na geração do zumbido e avaliar os tratamentos para o zumbido.


Assuntos
Humanos , Zumbido/fisiopatologia , Potenciais Evocados/fisiologia , Potenciais Evocados Auditivos/fisiologia , Atenção , Zumbido/psicologia , Potenciais Evocados P300/fisiologia , Medicina Baseada em Evidências
13.
Braz J Otorhinolaryngol ; 86(1): 119-126, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-31753780

RESUMO

INTRODUCTION: Tinnitus is sound perception in the absence of a sound source. Changes in parameters of latency and amplitude on the auditory event related potentials or long latency potentials waves have been cited in tinnitus patients when compared to a control group. OBJECTIVE: To perform an assessment of scientific evidence that verifies the possibility of alterations in latency or amplitude of the waves of event related potentials in individuals with tinnitus. METHODS: By using SciELO, Lilacs, ISI Web and PubMed, scientific databases, a review was performed. Articles published in English, Portuguese, French and Spanish that correlated tinnitus with changes in event related potentials were included in this review. RESULTS: Twelve articles were located, however only eight fulfilled the criteria for inclusion. CONCLUSION: The sample of selected studies demonstrate that the long latency auditory evoked potentials related to events between the control and tinnitus patients showed some changes in latency and or amplitude in tinnitus patients. There are changes in event-related potentials when comparing patients with tinnitus and the control group. These changes take place considering the severity of tinnitus, tinnitus site of lesion, and capacity for changes after interventions. The event related potentials can help to determine the neurotransmitter involved in tinnitus generation and evaluate tinnitus treatments.


Assuntos
Potenciais Evocados Auditivos/fisiologia , Potenciais Evocados/fisiologia , Zumbido/fisiopatologia , Atenção , Potenciais Evocados P300/fisiologia , Medicina Baseada em Evidências , Humanos , Zumbido/psicologia
14.
Audiol., Commun. res ; 25: e2399, 2020. tab, graf
Artigo em Português | LILACS | ID: biblio-1153169

RESUMO

RESUMO Objetivo Verificar a efetividade do treinamento auditivo acusticamente controlado em pessoas com distúrbio do processamento auditivo central e perda auditiva unilateral de grau severo a profundo. Métodos Participaram do estudo 16 indivíduos, de 13 a 21 anos de idade, diagnosticados com perda auditiva unilateral de grau severo a profundo e transtorno do processamento auditivo central, divididos em dois grupos, com oito indivíduos cada, pareados por idade, sexo e escolaridade: grupo estudo, submetido ao programa de treinamento auditivo acusticamente controlado, em oito sessões, realizadas uma vez por semana; grupo comparação, que não foi submetido a nenhum tipo de intervenção. Ao final de oito semanas, os grupos foram reavaliados quanto ao potencial evocado auditivo de longa latência (P300) e quanto às habilidades auditivas alteradas, observadas nos testes Localização Sonora, Identificação de Sentenças Sintéticas, Fala no Ruído e Randon Gap Detection Test. Resultados Não houve influências do lado da perda auditiva na avaliação inicial, para nenhum dos grupos. Na avaliação final, verificou-se, somente no grupo estudo, aprimoramento de todas as habilidades auditivas, diminuição da latência e aumento da amplitude no P300. Indivíduos com perda auditiva à direita apresentaram maior aumento da amplitude do P300. Não foram observadas modificações no grupo comparação. Conclusão O treinamento auditivo acusticamente controlado foi eficaz, pois possibilitou o aprimoramento das habilidades auditivas e a modificação na atividade neurobiológica quanto à velocidade de processamento auditivo. Sugere-se essa opção de intervenção em pessoas com transtorno do processamento auditivo central e perda auditiva unilateral.


ABSTRACT Purpose To verify the effectiveness of the auditory training acoustically controlled in people with central auditory processing disorders and unilateral hearing loss from severe to profound. Methods 16 individuals between the age of 13 to 21 diagnosed with unilateral hearing loss from severe to profound and central auditory process disorder has participated in this study, individuals were divided into two groups, consisting of eight individuals each, paired by age, sex and education. Eight of them - Experimental Group - underwent an individual Acoustically Controlled Auditory Training program consisting of eight sessions accomplished once a week. The remaining individuals - Control Group - there were no intervention. At the end of eight weeks, both groups were reassessed for Long Latency Auditory Evoked Potential (P300), and altered hearing abilities on the Sound Localization test, Synthetic Sentence Identification, Speech in Noise and Random Gap Detection Test. Results There were no influences of the hearing loss side in the initial assessment for any of the groups. In the final assessment there was an improvement in all abilities, decreased latency and increased amplitude in P300 only Experimental Group. Individuals with hearing loss on the right showed a greater increase in P300 amplitude. There were no changes in the Control Group. Conclusion The acoustically controlled auditory training was effective because it allowed an improvement of the auditory abilities and a modification in the neurobiological activity in relation to the auditory processing speed. This option it is suggested for intervention in people with a central auditory processing disorder and hearing loss.


Assuntos
Humanos , Adolescente , Adulto , Potenciais Evocados P300 , Perda Auditiva Unilateral/reabilitação , Perda Auditiva Unilateral/terapia , Testes Auditivos , Percepção Auditiva , Estudos Longitudinais , Resultado do Tratamento , Potenciais Evocados Auditivos
15.
Comput Intell Neurosci ; 2019: 9374802, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31885534

RESUMO

In this paper, we evaluate a semiautonomous brain-computer interface (BCI) for manipulation tasks. In such a system, the user controls a robotic arm through motor imagery commands. In traditional process-control BCI systems, the user has to provide those commands continuously in order to manipulate the effector of the robot step-by-step, which results in a tiresome process for simple tasks such as pick and replace an item from a surface. Here, we take a semiautonomous approach based on a conformal geometric algebra model that solves the inverse kinematics of the robot on the fly, and then the user only has to decide on the start of the movement and the final position of the effector (goal-selection approach). Under these conditions, we implemented pick-and-place tasks with a disk as an item and two target areas placed on the table at arbitrary positions. An artificial vision (AV) algorithm was used to obtain the positions of the items expressed in the robot frame through images captured with a webcam. Then, the AV algorithm is integrated into the inverse kinematics model to perform the manipulation tasks. As proof-of-concept, different users were trained to control the pick-and-place tasks through the process-control and semiautonomous goal-selection approaches so that the performance of both schemes could be compared. Our results show the superiority in performance of the semiautonomous approach as well as evidence of less mental fatigue with it.


Assuntos
Inteligência Artificial , Interfaces Cérebro-Computador , Robótica/métodos , Fenômenos Biomecânicos , Encéfalo/fisiologia , Eletroencefalografia/métodos , Potenciais Evocados P300 , Feminino , Objetivos , Humanos , Imaginação/fisiologia , Masculino , Fadiga Mental/etiologia , Modelos Teóricos , Atividade Motora/fisiologia , Estudo de Prova de Conceito , Processamento de Sinais Assistido por Computador , Adulto Jovem
16.
Med Biol Eng Comput ; 57(12): 2705-2715, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31728934

RESUMO

Brain computer interfaces (BCI) represent an alternative for patients whose cognitive functions are preserved, but are unable to communicate via conventional means. A commonly used BCI paradigm is based on the detection of event-related potentials, particularly the P300, immersed in the electroencephalogram (EEG). In order to transfer laboratory-tested BCIs into systems that can be used by at homes, it is relevant to investigate if it is possible to select a limited set of EEG channels that work for most subjects and across different sessions without a significant decrease in performance. In this work, two strategies for channel selection for a single-trial P300 brain computer interface were evaluated and compared. The first strategy was tailored specifically for each subject, whereas the second strategy aimed at finding a subject-independent set of channels. In both strategies, genetic algorithms (GAs) and recursive feature elimination algorithms were used. The classification stage was performed using a linear discriminant. A dataset of EEG recordings from 18 healthy subjects was used test the proposed configurations. Performance indexes were calculated to evaluate the system. Results showed that a fixed subset of four subject-independent EEG channels selected using GA provided the best compromise between BCI setup and single-trial system performance.


Assuntos
Encéfalo/fisiologia , Potenciais Evocados P300/fisiologia , Adulto , Algoritmos , Interfaces Cérebro-Computador , Eletroencefalografia/métodos , Potenciais Evocados/fisiologia , Feminino , Humanos , Masculino , Adulto Jovem
17.
Int J Psychophysiol ; 146: 85-100, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-31654696

RESUMO

Involuntary attention allows for the detection and processing of novel and potentially relevant stimuli that lie outside of cognitive focus. These processes comprise change detection in sensory contexts, automatic orientation toward this change, and the selection of adaptive responses, including reorientation to the original goal in cases when the detected change is not relevant for task demands. These processes have been studied using the Event-Related Potential (ERP) technique and have been associated to the Mismatch Negativity (MMN), the P3a, and the Reorienting Negativity (RON) electrophysiological components, respectively. This has allowed for the objective evaluation of the impact of different neuropsychiatric pathologies on involuntary attention. Additionally, these ERP have been proposed as alternative measures for the early detection of disease and the tracking of its progression. The objective of this review was to integrate the results reported to date about MMN, P3a, and RON in different neurological and psychiatric disorders. We included experimental studies with clinical populations that reported at least two of these three components in the same experimental paradigm. Overall, involuntary attention seems to reflect the state of cognitive integrity in different pathologies in adults. However, if the main goal for these ERP is to consider them as biomarkers, more research about their pathophysiological specificity in each disorder is needed, as well as improvement in the general experimental conditions under which these components are elicited. Nevertheless, these ERP represent a valuable neurophysiological tool for early detection and follow-up of diverse clinical populations.


Assuntos
Atenção/fisiologia , Percepção Auditiva/fisiologia , Potenciais Evocados P300/fisiologia , Transtornos Mentais/psicologia , Doenças do Sistema Nervoso/psicologia , Orientação/fisiologia , Estimulação Acústica/métodos , Humanos , Transtornos Mentais/fisiopatologia , Doenças do Sistema Nervoso/fisiopatologia
18.
Codas ; 31(4): e20180212, 2019 Sep 02.
Artigo em Inglês | MEDLINE | ID: mdl-31483042

RESUMO

This study aimed to measure the effects of a Computer-based Auditory Training Program (CBATP) on an adolescent diagnosed with Autism Spectrum Disorder (ASD) and Central Auditory Processing Disorder (CAPD). This is the case report of a male, 14-year-old adolescent diagnosed with ASD. The individual was submitted to basic audiological evaluation, central auditory processing assessment and hearing electrophysiology (EP), pre- and post-therapeutic intervention. Central auditory processing (CAP) was assessed by means of the following instruments: Time-compressed Speech Test (TCST), Random Gap Detection Test (RGDT), Staggered Spondaic Word Test (SSWT), Frequency (Pitch) Pattern Sequence Test (FPST), and Duration Pattern Test (DPT). The P300 component of the Event-related Potential (ERP) was used in the hearing EP. Pre-intervention assessment of CAP showed changes in the auditory skills of closure, figure-ground and temporal ordering, but normal temporal resolution ability. Post-intervention evaluation of CAP showed improvement in all previously mentioned auditory skills, except for the figure-ground ability, which remained unchanged. Regarding the findings of the hearing EP, a decrease in the latency of the P300 component was observed pre- and post-intervention. This study demonstrated that the use of a CBATP resulted in improvement in the hearing abilities assessed in an adolescent diagnosed with ASD.


Assuntos
Transtorno do Espectro Autista/complicações , Transtornos do Desenvolvimento da Linguagem/reabilitação , Adolescente , Transtorno do Espectro Autista/fisiopatologia , Potenciais Evocados P300/fisiologia , Humanos , Transtornos do Desenvolvimento da Linguagem/etiologia , Transtornos do Desenvolvimento da Linguagem/fisiopatologia , Estudos Longitudinais , Masculino
19.
Dement. neuropsychol ; 13(3): 299-304, July-Sept. 2019. tab
Artigo em Inglês | LILACS | ID: biblio-1039654

RESUMO

ABSTRACT Some cognitive dimensions, such as attention, memory and executive functions, may decline with age, while other functions remain intact or even improve due to greater life experience. Objective: to analyze the relationship between cognitive processing, language and verbal fluency among elderly individuals seen by primary healthcare services located in a city in the interior of São Paulo, Brazil. Methods: a cross-sectional study with a quantitative method was conducted. A total of 149 elderly individuals were assessed through previously scheduled interviews. Data collection included a questionnaire on sociodemographic data and the Addenbrooke's Cognitive Examination - Revised (ACE-R). Cognitive processing (P300) was assessed using a device that captures potentials elicited in auditory tasks. Descriptive analysis and Spearman's correlation were performed with the level of significance established at 5%. Results: a negative correlation was found between language and P300 latency, while a positive correlation was found between verbal fluency and P300 amplitude. Comprehension and naming tasks showed a negative correlation with latency. The repetition task revealed a positive correlation with P300 amplitude. Conclusion: although more extensive testing is needed, these findings suggest that language correlates with P300 latency, whereas verbal fluency correlates with P300 amplitude.


RESUMO As dimensões cognitivas, como atenção, memória e funções executivas, podem diminuir com a idade, enquanto outras funções permanecem ou até melhoram devido a uma maior experiência de vida. Objetivo: analisar a relação entre processamento cognitivo, linguagem e fluência verbal em idosos atendidos em serviços de atenção básica localizados em um município do interior de São Paulo, Brasil. Métodos: estudo transversal, método quantitativo. Um total de 149 idosos foram avaliados por meio de entrevistas previamente agendadas. A coleta de dados incluiu um questionário abordando dados sociodemográficos e o Exame Cognitivo de Addenbrooke - Revisado (ACE-R). O processamento cognitivo (P300) foi avaliado por meio de um dispositivo que capta potenciais elicitados em tarefas auditivas. A análise descritiva e a correlação de Spearman foram realizadas com o nível de significância estabelecido em 5%./ Resultados: foi encontrada correlação negativa entre a linguagem e a latência do P300 e uma correlação positiva entre a fluência verbal e a amplitude do P300. Tarefas de compreensão e nomeação apresentaram uma correlação negativa com a latência. A tarefa de repetição revelou correlação positiva com a amplitude do P300. Conclusão: embora testes mais extensos sejam necessários, esses achados sugerem que a correlação de linguagem com a latência e fluência do P300 está correlacionada com a amplitude do P300.


Assuntos
Humanos , Idoso , Envelhecimento , Potenciais Evocados P300 , Idioma
20.
Braz. j. otorhinolaryngol. (Impr.) ; Braz. j. otorhinolaryngol. (Impr.);85(4): 510-519, July-Aug. 2019. tab, graf
Artigo em Inglês | LILACS | ID: biblio-1019591

RESUMO

Abstract Introduction: The patient's evolution in the audiology and speech-language clinic acts as a motivator of the therapeutic process, contributing to patient adherence to the treatment and allowing the therapist to review and/or maintain their clinical therapeutic conducts. Electrophysiological measures, such as the P300 evoked potential, help in the evaluation, understanding and monitoring of human communication disorders, thus facilitating the prognosis definition in each case. Objective: To determine whether the audiology and speech-language therapy influences the variation of P300 latency and amplitude in patients with speech disorders undergoing speech therapy. Methods: This is a systematic review with meta-analysis, in which the following databases were searched: Pubmed, ScienceDirect, SCOPUS, Web of Science, SciELO and LILACS, in addition to the gray literature bases: OpenGrey.eu and DissOnline. The inclusion criteria were randomized or non-randomized clinical trials, without language or date restriction, which evaluated children with language disorders undergoing speech therapy, monitored by P300, compared to children without intervention. Results: The mean difference between the latencies in the group submitted to therapy and the control group was −20.12 ms with a 95% confidence interval of −43.98 to 3.74 ms (p = 0.08, I 2 = 25% and p value = 0.26). The mean difference between the amplitudes of the group submitted to therapy and the control group was 0.73 uV with a 95% confidence interval of −1.77 to 3.23 uV (p = 0.57, I 2 = 0% and p value = 0.47). Conclusion: The present meta-analysis demonstrates that speech therapy does not influence the latency and amplitude results of the P300 evoked potential in children undergoing speech therapy intervention.


Resumo Introdução: A evolução do paciente na clínica fonoaudiológica atua como fator motivador do processo terapêutico, contribui para a sua adesão ao tratamento e possibilita ao terapeuta a revisão e/ou a manutenção de suas condutas. As medidas eletrofisiológicas, como o potencial evocado P300, auxiliam na avaliação, na compreensão e no monitoramento dos distúrbios da comunicação humana, facilitam, dessa forma, a definição do prognóstico de cada caso. Objetivo: Determinar se a terapia fonoaudiológica influencia na variação da latência e da amplitude do P300 em pacientes com distúrbio de linguagem submetidos à terapia fonoaudiológica. Método: Revisão sistemática com metanálise, na qual foram feitas buscas nas seguintes bases de dados: Pubmed, ScienceDirect, Scopus, Web of Science, SciELO e Lilacs, além das bases de literatura cinzenta: OpenGrey.eu e DissOnline. Foram considerados critérios de inclusão: ensaios clínicos aleatórios ou não, sem restrição de idiomas ou data, que submeteram crianças com distúrbio de linguagem à terapia fonoaudiológica, monitoradas pelo P300, comparadas a crianças sem intervenção. Resultados: A diferença média entre as latências do grupo submetido à terapia e do grupo controle foi de -20,12 ms com intervalo de confiança 95% entre -43,98 e 3,74 ms (p = 0,08; I2 = 25% e o valor de p = 0,26). A diferença média entre as amplitudes do grupo submetido à terapia e do grupo controle foi de 0,73 uV com intervalo de confiança de 95% entre -1,77 e 3,23 uV (p = 0,57; I2 = 0% e o valor de p = 0,47). Conclusão: A terapia fonoaudiológica não influencia nos resultados de latência e amplitude do potencial evocado P300 em crianças submetidas à intervenção fonoaudiológica.


Assuntos
Humanos , Distúrbios da Fala/terapia , Fonoterapia/métodos , Potenciais Evocados P300 , Terapia da Linguagem/métodos , Eletrofisiologia
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